摘要
在嵌入式系统中开发USB摄像头驱动需要充分利用USB总线带宽并保证内存与摄像头之间数据的高速稳定交换。为满足该要求,参考开源项目GSPCA/SPCA5xx,采纳Linux内核建议并遵循Video4Linux标准,提出双URB分配策略和MMAP内存映射机制以最大限度地提高视频采集速度。在S3C2440AL_ARM开发平台上设计并实现USB摄像头的嵌入式Linux设备驱动,对该驱动程序进行功能验证和性能分析。
In the design and development of USB camera drive based on embedded system,it should make full use of USB bus bandwidth and ensure a high and stable data transfer speed between memory and peripherals.In order to meet the real-time video capturing requirements,reference is made to open-source projects GSPCA/SPCA5xx,recommendation of Linux kernel is adopted,and using double-URB strategy and MMAP mapping mechanism to maximize the video capturing speed,eventually realizes this USB camera drive in line with Video4Linux on the S3C2440AL_ARM development platform and provides a functional verification and performance analysis.
出处
《计算机工程》
CAS
CSCD
北大核心
2010年第9期282-284,共3页
Computer Engineering
基金
国家"十一五"科技支撑计划基金资助重点项目(2009BAI71B02)
北京市属高等学校人才强教计划基金资助项目(PHR201007121)
北方工业大学重点研究基金资助项目(NCUT20090106)
